Abstract
Next to perfection, it may seem, have been done by Mr. Fujii and many their predecessors, in connection with the treatise on the economical life of incandescent electric lamps of modern practice. The writer, however, proceeds, from every view of point possible, to the further study of choice of the economical size and the influence of the cost of electric lamps thereon, considering their wattage or candle as variables, which in quite on opposite basis to the scrutiny of the economical life, with the assumption of a number of functions connecting the size and efficiency, cost or charge, etc. of electric lamps that conform to the precent standard specifications; the conclusion reveals,
(A) For electric light companies with respect to their flat rate system customers
(1) The lowest economic limit of B lamp is approximately independent of burning hours,
(2) Inversely proportional to the inclination angle to the c.p.axis of the straight line, which. is assumed to be the relation between c.p.and the monthly charge of a B lamp in the flat rate system.
(3) Inversely proportional to the inclination angle to the c.p.axis of the straight line which is assumed, on the logorithimic scale, to he the relation between c.p.and specific consum ption.
(B) For meter system customers,
(1) Inversely proportional to the inclination angle to the c.p.axis of the straight line which is assumed to be the relation between c.p.and cost of B lamps,
(2) Proportional to the constant of the straight line above mentioned.
(3) The same condition holds into that given in case
(A). The practical applications of numericals give, for the both case respectively, 50 cp and 100 watt.
